Method of making pneumatic tires.



R. GRIFFITH.

METHOD OF MAKING PNEUMATIC TIRES.

APPLICATION FILED OCT. 10, 1914.

Patented Aug; 10, 1915.

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. Richard 'W 15th pivrr crass ra RICHARD GRIFFITH. OF AKRON. OHIO,ASSIGNOR TO MILLER RUBBER COMPANY, OF AKRON, OHIO, A CORPORATION OFOHIO.

METHOD OF MAKING PNEUMATIC TIRES.

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Specification of Letters Patent.

Patented Aug. 10, 1915.

Application filed October 10, 1914. Serial No. 866,132.

I To all 107mm it may concern Be it known that I, RlCHAnD GRIFFITH, acitizen of the United States, residing at Akron, in the county of Summitand State of Ohio, have invented certain new and useful Improvements inMethods of Making Pneumatic Tires, of which the following is aspecification.

The present invention relates to improvements in tire casings andprovides an improved method of constructing thesame.

The invention has for its principal object to provide a tire casingadapted to be constructed upon a ring core or mandrel of circular crosssection and treats more particularly with the construction of such acasing 'as one which contains a cord carcass.

The invention further contemplates a novel method in constructing thecord carcass upon the mandrel and in embodying the bead cores thereinduring the process of construction.

With these and other objects in view, the invention consists in thenovel features, arrangement and construction of parts described morefully in the following specification, illustrated in the accompanyingdrawings, and pointed out in the appended claims.

In the drawings: Figure 1 i a perspective View of the ring core showingthe manner in which the first ply of cords is applied thereto inconstructing the carcass. Fig. 2 is an end elevation showing thecomplete cord carcass after the bead cores have been built therein.

-Referring now to the drawings, a ring core or mandrel l ofsubstantially circular cross section i employed, around theouter surfaceof which the cord carcass of the tire casing is built. The cords 2 ofwhich the carcass of the tire casing is constructed may be of anysuitable form but are preferably flexible cord such as could be made bytwisting a plurality of rubber coated strands or threads about a centralsoft core of rubber.

The present invention isnot intended to be limited to the type of cordused vand a hollow flexible twisted .cord may be employed or any similarcord such as for example, that described in applioants co-pend-. ingapplication filed of even date herewith. he cords used prefer ably havetheir exte- The flexible cord 2 employed is then cut into strips ofequal lengths and the several individual strips are applied around thecore 1 being disposed in parallel relation to one another and at anangle of approximately sixty degrees to the circumferential surface ofthe core or mandrel. The ends of the cords- 2 are brought into contactwith the two strips 3 of adhesive tape and held in place thereby. Thesebead cores 4 will adhere to the surface of the ends of the cords andwill be retained in proper position until the second ply of cords ofwhich the caroass is constructed has been applied. This second ply ofcords is similarly composed of a plurality of flexible cords previouslyout into equal lengths and the cords are applied around the outersurface of the first ply, being disposed at a reverse angle to those ofthe first ply. Their ends are pressed into contact with the outersurface of the bead cores 4 and will be held there due to the adhesivenature of the latter, thus obviating the necessity of providing secondstrips of adhesive tape for this ply of cords. It will be understoodthat the cords of which these plies are composed lie around the surfaceof the core, being parallel to one another and the distance between theindividual cords of the plies may be varied as desired. They are hereshown and will preferably be built into the carcass completely out ofcontact with one another, the distance between them however, varyingsomewhat due to the differences of the inner and outer circumference ofthe ring core.

A tire casing in which the cord carcass has been constructed in theabove manner would possess all of the advantages of a similar casing,which had been formed by completely wrapping the cords of the separateplies about the ring core and subse scribed and illustrated with twistedflexible curds as the elements of which the carcass is made up, itnevertheless might be. varied Without departing from the spirit of myinvention, by employing strips of tape or other suitable fabric andapplying them in this manner to the ring core or mandrel.

- Having thus fully described my invention, what 1 claim as new anddesire to secure Letters Patent of the United States, isz- 1. The hereindescribed method of 11131111;- facturing acarcass for tire casingsconsisting of cutting equal leligths of flexible rope, having its outersurface coated with suitable adhesive applying strips of adhesive fabricto a ring core at the bead points, applying the lengths of rope aroundthe ring core at an angle .to the circumferential surface thereof. andsecuring their ends to the adhesive fabric,substantially as described.

'2. The herein described method of menufiopies of this patent may beobtained for five cents cuinferential surface of the cor and secur ingthe ends of said cord lengths tot-he strips of adhesive fabric, appl mgbead cores cc suid ply at suitable points and then apply-- mg a secondsimilar ply of paralle cords and securing their ends around and to thebead cores, substantially as described.

In testimony whereof I allix my signature in presence of two itnesses. iH

RICHARD GB] FFlT ll. Witucsses (EA. l

Vom IiUF-SICLL D, BriLnnN.

each, by addressing the Commissioner of Patents,

Washington, D. C.

